According to the report, Curran suffered the injury in training Tuesday morning during the third round of sparring at his gym in a suburb outside of Chicago. No word just yet on whether Freire will remain on the Bellator 73 card at Harrah's Tunica Hotel and Casino in Mississippi.

Curran (17-4) is 4-0 since dropping down to featherweight in June 2011. He knocked Joe Warren in March to capture the promotion's 145-pound title.

Freire (17-1) won the Bellator Season 4 featherweight tournament in May 2011 to earn a shot at the title.

Daniel Straus (20-4) won the Season 6 featherweight tournament this past May, so he'll now have to wait a little longer to fight the winner of Curran vs. Freire.